Improvement in machines for jointing staves



' c. J. HALL.

Improvement in Machines for jointing- Staves.

N0. 129,949, Patented July 30,1872.

- Tz'yl.

CYRUS J. HALL, on MOUNT DESERT, MAINE.

IMPROVEMENT IN MACHINES FOR JOINTING STAVES.

Specification forming part of Letters Patent No. 129,949, dated July 30, 1872.

To all persons to whom these presents may come:

, Be it known that I, CYRUS J. HALL, of Mount Desert, of the county of Hancock and State of Maine, have invented a new and useful Improvement in Machines for J ointing Staves; and I do hereby declare the same to be fully described in the following specification and represented in the accompanying drawing, of which-'- Figure 1 is a top view, Fig. 2 an end elevation, Fig. 3 a side elevation, and Fig. 4 a transverse section of the machine.

In its principal features it is like the machine described in Letters-Patent No. 123,693, dated February 13, 1872, and granted tome.

In carrying out'my present invention I have combined with the mechanism for efl'ectin g the necessary springing of the guide-rail a mechanism to counterbalance the resistance or elastic power of the guide-rail; also mechanism by which I am saved the necessity of turning the stave end for end, inorder to' joint one edge with the proper bevel after the other edge may have been jointed, my mechanism requirin g the stave to be turned transversely, whereby a material saving in labor and time in effecting the beveling and jointing of it is obtained.

In the drawing, A denotes the frame for supporting the principal operative parts. This frame is provided with a shaft, B, a saw, D, and a driving-pulley, C, to said shaft, all being arranged as shown. Furthermore, there is fixed at its middle to the frame A, or to a short post, a, extended up therefrom, a thin-flexible or elastic rail, E, connected at its ends to arms I) '72 extended upward from a rock-shaft, 0, arranged in the frame A in the manner as shown. The carriage F, for supporting the stave and moving it along with respect to the saw, rests and is notched upon the rail E. This carriage supports a shaft, G, provided with two arms, H H, extendedup from it, and with respect to the top part or stave-supporter f of the'carriage F, in manner as shown. Furthermore,

" there projects down from the shaft Ga shorter arm, 9, which is to operate with a plate, K, having a triangular notch or recess, m, such plate being fixedto the frame A by set-screws 0 0 going through vertical slots 10 p in arms projecting down from the plate. The carriage F is" also supported by a second stationary rail, I, arranged asrepresented. From the rockshaft 0 there is extended an arm, K, pivoted at its outer end to a connection bar or rod, L,

which depends from the shorter arm of a bent lever, M, such lever being pivoted to the frame A and having a weight, N, suspended from its longer arm, all being'as represented. The arm K, the rod L, the lever M, and weight N are to counterbalance the resistance or elastic power of the rail E. As the said rail may be more -or less bent, the shaft of its supporting-arms will be turned, and, by the arm K and rod L, will move the bent lever M so as to cause the weight suspended from. it to counterbalance the elastic force of the rail, however such may be increased or diminished. While the carriage is in the act of being drawn backward the arm y will enter the notch m up to its vertex, in which case the plate in which the notch is becomes a fulcrum for the lever composed of the arm g and the next adjacent arm H. When a stave is laid on the carriage such stave is to be moved laterally, so asto cause the said arm H and its fellow arm H to be moved laterally simultaneously, in which case the guide-rail willbe sprung or curved, as may be desirable,

.to cause the stave to have the requisite bilge when sawed from end to end by the saw.

It will be seen that in order to give to the edge of the stave the requisite bevel the supporting top f of the carriage is inclined laterally, as shown. For properly supporting the stave so as to cause its opposite edge to be sawed with the requisite bilge and bevel each of the arms H may be provided with a fixed shoulder, arranged as shown at s, or, what is betterra movable and adjustable one, as shown at t. The said shoulder t is a sleeve encompassing the arm H and resting on an inclined and slotted plate, a, projected from the carriage,

the arm going through the slot of the plate.

A top view of the said plate is shown in Fig. 5, Fig. 6 representing on an enlarged scale a vertical section of the arm H, the plate a, and the sleeve or mouth shoulder t. The plate a is inclined so as to cause the sleeve to rise as the arm H may be moved away from the part f of the carriage, the whole being in order to vary the inclination of the stave to get the requisite bevel, whatever may be the width of the stave. After the stave may have been jointed on one edge, with the concave side of the stave resting on the support-plate f, the stave is to be turned transversely, so as to bring the concave side uppermost. The stave is next to rest on the plate f and the shoulders or sleeves of the arms H. Under this state of things the carriage, on being moved forward on the curved rail, will cause the stave to be jointed on its other edge and cut with the requisite bilge and bevel. To one arm, b, there is pivoted a clampplate, a, to rest against the under side of a stationary bar or part, b, of the frame A, (see Fig. 7,) which is a vertical section taken through the plate a, the arm I), the bar I), the clamplever 0, its operative spring 01, and adjustable cammed arm 0, all being formed and arranged as shown. The said parts a and d, being to perform the functions of the lever K, arm 1*, and spring L, as shown and explained in my said patent, need no further description.

Unless the elastic guide-rail is provided with the counterbalance mechanism, as described, the stave is liable to be cut with one end narrower than the other. The counterbalance saves the operator the necessity of overcoming by manual power the resistance or elastic force of the rail while he may be adjusting a stave on the carriage. He is therefore better able to hold the stave in place in the carriage while or previously to starting it forward.

I herein make no claim to any mechanism described and claimed in my aforesaid patent.

What I claim as my present invention is as follows, viz.:

1. The combination of the counterbalance mechanism, as described, with the elastic guide-rail and the mechanism, substantially as explained, for effecting the springing of the rail by the stave while being adjusted upon the carriage.

2. I claim the arms H H, provided. with the stationary or adjustable shoulders s or t, for supporting the stave under circumstances, as set forth.

0. J. HALL. Witnesses:

R. H .EDDY, J. R. 'SNow. 

